Thematische Bibliographien / Chemická struktura

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Auswahl der wissenschaftlichen Literatur zum Thema „Chemická struktura“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 6. Februar 2022

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Zeitschriftenartikel zum Thema "Chemická struktura"

BIELINSKI, DARIUSZ M., MARCIN KAJZER, LUDOMIR SLUSARSKI und LUKASZ KACZMAREK. „Gradient structure of polymer materials“. Polimery 50, Nr. 04 (April 2005): 298–304. http://dx.doi.org/10.14314/polimery.2005.298.

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Pyszka, Ilona. „Modyfikowane struktury dibenzofenazyny jako fotoinicjatory polimeryzacji rodnikowej triakrylanu trimetylolopropanu. Wpływ liczby atomów azotu w strukturze“. PRZEMYSŁ CHEMICZNY 1, Nr. 11 (23.11.2020): 53–57. http://dx.doi.org/10.15199/62.2020.11.3.

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STEPIEN, AGNIESZKA EWA. „Assessment of the effect of biodegradation on the chemical structure of poly(ether urethanes)“. Polimery 57, Nr. 7/8 (Juli 2012): 5454–550. http://dx.doi.org/10.14314/polimery.2012.545.

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Malcher, Tadeusz. „Struktura roztworów polimerowo-micelarnych“. PRZEMYSŁ CHEMICZNY 1, Nr. 9 (08.09.2020): 84–85. http://dx.doi.org/10.15199/62.2020.9.17.

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RZYMSKI, WLADYSLAW M., und BARBARA WOLSKA. „Physical structure and topology of elastomers networks“. Polimery 48, Nr. 04 (April 2003): 246–53. http://dx.doi.org/10.14314/polimery.2003.246.

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ADAMUS, GRAZYNA, und MAREK KOWALCZUK. „Multistage mass spectrometry studies on the chemical structure of aliphatic polyester macromolecules“. Polimery 46, Nr. 07/08 (Juli 2001): 501–10. http://dx.doi.org/10.14314/polimery.2001.501.

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KOZLOWSKA, AGNIESZKA, und JERZY MAJSZCZYK. „Relaxation processes and phase structure of ester-etheramide copolymers“. Polimery 50, Nr. 11/12 (November 2005): 844–50. http://dx.doi.org/10.14314/polimery.2005.844.

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Maslova, N. S., und Vladimir I. Panov. „Scanning tunneling microscopy of atomic structure, electronic properties, and surface chemical reactions“. Uspekhi Fizicheskih Nauk 157, Nr. 1 (1989): 185. http://dx.doi.org/10.3367/ufnr.0157.198901f.0185.

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Guggolz, E., G. Karger und A. Kerk. „Struktur und Akzente“. Nachrichten aus der Chemie 48, Nr. 12 (Dezember 2000): 1455. http://dx.doi.org/10.1002/nadc.20000481202.

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Ryszkowska, Joanna, Monika Auguscik, Milena Leszczynska, Kamila Mizera, Lukasz Wierzbicki, Tadeusz Szymczak, Piotr Lasota, Kamil Lipert und Marzena Polka. „Polyurethane composite structures with 3D fabrics“. Polimery 63, Nr. 09 (September 2018): 611–18. http://dx.doi.org/10.14314/polimery.2018.9.5.

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Dissertationen zum Thema "Chemická struktura"

Olivová, Lucie. „Chemická analýza a-CSi:H a a-CSiO:H vrstev“. Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444209.

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Plasma-enhanced chemical vapor deposition is a promising technology for the preparation of materials in the form of thin films with controlled physical-chemical properties, which can be affected by changing input precursors or deposition conditions as needed. In this thesis, plasma nanotechnology was used to synthesize thin films on silicon wafers. Tetravinylsilane was chosen as a precursor for the synthesis of the films. In addition to pure tetravinylsilane, mixtures of tetravinylsilane with argon and mixtures of tetravinylsilane with oxygen were also used as input precursors for film deposition, in different proportions of the individual component in the deposition mixture. Using chemical analyses, specifically infrared spectroscopy, photoelectron spectroscopy and selected ion techniques, the chemical structure of the prepared films was examined in detail and the dependence of this structure on deposition conditions and input precursors was studied. This thesis confirms, that by changing effective power supplied to the plasma discharge and selecting different input precursors, it is possible to control chemical structure, and thus the properties of the prepared nanolayers.

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Ševčík, Ivan. „Systém pro vyhledávání chemických struktur“. Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2018. http://www.nusl.cz/ntk/nusl-385936.

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This thesis deals with the problem of searching of structures in large chemical compounds databases. The aim is to design and implement an efficient system that supports two basic types of search, which are identity and substructure search. This task is complicated not only by the large number of entries in databases but also by graph representation of chemical structures, for which many algorithms are hard to solve. The thesis will introduce concepts which will prove useful in solving these problems. A web service is also created as a part of the thesis in order to make the database searching available to the users.

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Stehnová, Ivana. „Vliv chemické struktury změkčovadla na vlastnosti bioplastu na bázi polyhydroxybutyrátu“. Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-438891.

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This master’s thesis deals with plasticization of poly(3-hydroxybutyrate), polylactid acid and their blend. It explores effect of chemical structure of plasticizer on mechanical properties of this polymer blend and on its diffusion from the polymer blend. Syntheses of plasticizers based on oligomeric polyadipates, citrates, lactate and esters of 2 ethylhexanoic acid with poly(ethyleneglycol) were carried out. Molecular weight distribution of synthesized plasticizers was determined using gel permeation chromatography. Poly(3-hydroxybutyrate), polylactid acid and their blend were plasticized with synthesized and commercial plasticizers. From commercial, chosed plasticizers were based on citrates and ester of 2-ethylhexanoic acid with poly(ethyleneglycol). Thermal stability of selected commercial plasticizers in polylactid acid was studied using thermogravimetry. Diffusion of plasticizers from poly(3-hydroxybutyrate), polylactid acid and their blend during exposure to 110 °C was also investigated. Mechanical properties of prepared blends were tested by tensile test. Almost all used plasticizers showed positive softening effect in blend. The highest elongation at break was detected for the blend with commercial acetyltributylcitrate, where elongation at break reached 328 % relative to 21 % for neat non-plasticized blend.

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Lysáček, David. „Tenké vrstvy polykrystalického křemíku“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233931.

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The doctoral thesis deals with the structure and properties of the polycrystalline silicon layers deposited on the silicon wafers backside. The wafers are further used for production of semiconductor devices. This work is focused on detailed description of the layers structure and study of the gettering properties and residual stress of the layers. The main goal of this work is to develop two novel technologies. The first one leads to improvement of the temperature stability of the gettering properties of the layers, and the second one solves the deposition of the layers with pre-determined residual stress. This doctoral thesis was created with the support of the company ON Semiconductor Czech Republic, Rožnov pod Radhoštěm.

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Musilová, Iveta. „PROGRESIVNÍ VÝROBNÍ POSTUPY A MODELOVÁNÍ STRUKTUR A VLASTNOSTÍ LITIN S KULIČKOVÝM GRAFITEM“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233882.

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The thesis is concerned with relationships between progressive technological processes of spheroidal graphite cast iron’s production and their structural properties. The aim of the work is to explain causal relationship between parameters of the proposed manufacturing technology of the iron type given (involving selected variants of modification and inoculation of melt and the parameters of melt crystallization, solidification and cooling down in a mould), their structure and even chemical heterogeneity of elements in this structure. For close specification of presented relationships three-dimensional model of spheroidal graphite growth was used, which was developed at the Brno University of Technology, Faculty of Mechanical Engineering. Its usability in praxis has been verified on the basisis of the application of this model on experimentally acquired data. The U GRAFIT 20 model of the authors Stránský and Million counting segregation in the frame of eutectic cell has not still been used for prediction of segregation in real condition in greater extent. On the basis of the above mentioned model microsegregation within “on average” of the cell has been discovered during experimental melts. Microsegregation has been described by segregation and heterogeneity indexes. Calculated values of segregation and heterogeneity indexes have been compared with experimentally verified values. On the basis of comparison of calculated and measured values the possibility of further usage of the mentioned model in praxis has been explored.

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Chmela, Ondřej. „Pokovování polyetylentereftalátu mědí a realizace vodivých struktur“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220081.

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The content of this master’s thesis are methods of pretreatment and coating of the surface of PET to produce conductive copper structure and quality control. Thesis also includes theoretical analysis of these methods. Physical and chemical techniques of surface pretreatment methods are discussed in the theoretical part as well as methods making surface of substrate conductive, the subsequent galvanic copper plating and quality control of coating and testing of the adhesion between layers. The experimental part focuses on two methods of the polymer material surface pretreatments. The properties of these pretreatments were evaluated by using the atomic force microscopy and detection of surface energy by wetting and contact angle measurements. The surface is making conductive with cathode sputtering and electrochemical coating of copper. Adhesion of layers is tested mainly with scratch test and other methods. The results of these sub-operations are used for the realization of multi-layer conductive structures.

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Pozdniakovaitė, Natalija. „Žmogaus baltymo p14.5 geno struktūra bei funkcija normaliose ir onkoproliferuojančiose ląstelėse“. Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060622_093527-75486.

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Human p14.5 perchloric acid-soluble protein (PSP) is a member of family (YER057c/YJGF family) of small proteins. The highly conserved throughout evolution proteins are characterized as multifunctional proteins comprised of ~ 80 homologues exhibiting varying degrees of sequence homology from 38 % to 93 %. The proteins are involved in different cellular pathways of lower and higher eukaryotes. The biological role of these proteins is not yet well characterized. Human p14.5 protein is homologue of UK114 protein extracted from goat liver and characterized as tumor antigen. Antibodies raised against UK114 mediate in vitro complement-depended cytolysis of human cancer cells. This suggests that the expression of human p14.5 protein on the cells membrane might be an event related to neoplasmic transformation. Available literature data demonstrate that human p14.5 gene acts as human cancer antigen and is involved into cellular proliferation events. Human p14.5 gene has been characterized by a differentiation-dependent mRNA and protein expression based on the observation of a low expression in a variety of liver and kidney tumor cells and a high expression in fully differentiated cells. At the beginning of our studies no data about human p14.5 gene full structure, coding protein p14.5 structure, biological functions of target protein in normal and tumor cells were available. The research study was initiated and supported by biopharmaceutical company UAB Sicor-Biotech and granted by... [to full text]

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Stejskal, Marek. „Vliv chemického složení a tepelného zpracování na strukturu a vlastnosti dvoufázových austeniticko-feritických korozivzdorných ocelí“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382114.

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This thesis focused on austenitic-ferritic (duplex) stainless steels and their mechanical and technological properties. The theoretical part includes introduction to chemical composition, structure, heat treatment and properties of these steels. The practical part focuses on influence of casting temperature on technological properties of ASTM A890 Gr4A stainless duplex steel. Furthermore, there is evaluated influence of chemical composition and heat treatment on structure and mechanical properties of different duplex stainless steels.

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Kaněra, Miloš. „Výroba odlitků z austeniticko-feritických hyperduplexních korozivzdorných ocelích“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445174.

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The thesis deals with hyper duplex stainless austenitic-ferritic steels and their mechanical and castability properties. The evaluation of resistance to pitting corrosion is divided by PRE values. Steels with a PRE value higher than 48 belong to the group of hyper duplex steels. The theoretical part contains an introduction to the chemical composition, structure and properties of these steels. The practical part is focused on the conditions of tendency to crack castings during solidification and cooling. Furthermore, there is evaluated influence of intermetallic phases on mechanical properties.

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Czulucki, Andreas. „Struktur-/Eigenschafts-Beziehungen in ternären Übergangs- und Seltenerdmetall-Pniktid-Chalkogeniden“. Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-33354.

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Ziel dieser Arbeit war es, Beziehungen zwischen den kristallchemischen Eigenschaften und dem beobachteten anomalen Verhalten im spezifischen elektrischen Widerstand (nicht-magnetischer Kondo-Effekt) aufzuzeigen und zusammenhängend zu interpretieren. Verbindungen, an denen dieser Effekt beobachtet wurde, werden aus einem Übergangs-, oder Actinidmetall mit je einem Vertreter der 15. (Pniktogene) und 16. Gruppe (Chalkogene) des Periodensystems gebildet und kristallisieren im PbFCl-Strukturtyp. Da zu ternären Actinidmetall-Pniktid-Chalkogeniden (z.B. ThAsSe, UPS) nur sehr wenige chemische und kristallographische Informationen existieren, wurden in dieser Arbeit umfassende Untersuchungen zur Kristallchemie ternärer Phasen aus den Systemen M-Pn-Q (M = Zr, Hf, La-Ce; Pn = As, Sb; Q = Se, Te durchgeführt. Der Schwerpunkt lag dabei auf der strukturellen Lokalisierung der beobachteten Widerstandsanomalie und der Erarbeitung chemisch-physikalischer Eigenschaftsbeziehungen. Die Darstellung der untersuchten ternären Phasen in Form von Einkristallen gelang über exothermen Chemischen Transport mit Jod. Da die erhaltenen Kristalle bis zu mehreren Millimetern groß sind, konnten an ein und demselben Kristallindividuum sowohl die stoffliche Charakterisierung (EDXS, WDXS, ICP-OES, LA-ICP-MS, CIC) und die strukturelle Charakterisierung, als auch die Messung der physikalischen Eigenschaften erfolgen. Es konnte u.a. gezeigt werden, dass ZrAs1,4Se0,5 und HfAs1,7Se0,2 ein ähnlich ungewöhnliches Verhalten im temperaturabhängigen elektrischen Widerstand zeigen, welches bereits an Thorium-Arsenid-Seleniden und Uran-Phosphid-Sulfiden beobachtet wurde. Desweiteren gelang es den beobachteten Verlauf im elektrischen Widerstand, mit seinem Minium bei etwa T = 15 K, auf intrinsische strukturelle Merkmale in der anionischen Arsen-Teilstruktur zurückzuführen
The aim of this work was, to evaluate and interpret a relationship between the crystal-chemical properties and the observed unusual behavior in the electrical resistivity (non-magnetic Kondo-effect). Compounds, which show such an effect, are formed by a transition- or actinide-metal with both a group 15 element and a group 16 element of the periodic table. All these compounds crystallizing in the PbFCl type of structure. Because of less crystallographic and chemical information about actinide-metal-pnictide-chalcogenides (i.e. ThAsSe, UPS), intensive investigation were made concerning the crystal-chemistry of ternary phases of the systems M-Pn-Q (M = Zr, Hf, La-Ce; Pn = As, Sb; Q = Se, Te. Our studies were focused on the structurally localization of the observed anomaly in the electrical resistivity and the evaluation of chemical-physical relations of properties. The synthesis of the investigated ternary phases was realized by exothermically Chemical Transport with iodine as transport agent. The dimension of the synthesized crystals allowed a chemical (EDXS, WDXS, ICP-OES, LA-ICP-MS, CIC) and structurally characterization, as well as a determination of the physical properties on one large single crystal. It could be shown, that ZrAs1,4Se0,5 and HfAs1,7Se0,2 reveal a similar unusual behavior in the temperature dependent electrical resistivity, as it was observed in thorium-arsenide-selenides and uranium-phosphide-sulphides. In conclusion, the non-magnetic Kondo-effect, which was found in the low-temperature range (about 15 K), arises from structurally features of the anionic sublattice with arsenic

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Bücher zum Thema "Chemická struktura"

I, Vovna V., und Baranovskiĭ I. B, Hrsg. Ėlektronnai͡a︡ struktura khimicheskikh soedineniĭ. Moskva: "Nauka", 1987.

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Hudeček, Jiří. Fyzikálně chemická podmíněnost struktury bílkovin: Metody popisu a predikce struktury. Praha: Academia, 1989.

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Sarbak, Zenon. Struktura i aktywność katalizatorów hydrodenitrogenacji. Poznań: Wydawn. Nauk. Uniwersytetu im. Adama Mickiewicza w Poznaniu, 1985.

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A handbook of computational chemistry: A practical guide to chemical structure and energy calculations. New York: Wiley, 1985.

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Allenov, M. I. Struktura opticheskogo izluchenii͡a︡ prirodnykh obʺektov. Moskva: Moskovskoe otd-nie Gidrometeoizdata, 1988.

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1962-, Montney Charles B., Hrsg. Chemical compounds. Detroit: UXL, 2006.

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Bathelt, Harald. Chemiestandort Deutschland: Technologischer Wandel, Arbeitsteilung und geographische Strukturen in der chemischen Industrie. Berlin: Sigma, 1997.

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Symmetry and structure: Readable group theory for chemists. 2. Aufl. Chichester: Wiley, 1995.

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Symmetry and structure: Readable group theory for chemists. 3. Aufl. Hoboken, N.J: John Wiley, 2007.

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Symmetry and structure. Chichester [West Sussex]: Wiley, 1985.

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Konferenzberichte zum Thema "Chemická struktura"

Kalmanova, V. B. „ЭКОЛОГО-ГЕОХИМИЧЕСКОЕ РАЙОНИРОВАНИЕ ТЕРРИТОРИИГ. БИРОБИДЖАНА ПО УРОВНЮ ЗАГРЯЗНЕНИЯ СНЕЖНОГО ПОКРОВА“. In Geosistemy vostochnyh raionov Rossii: osobennosti ih struktur i prostranstvennogo razvitiia. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.35735/tig.2019.81.41.013.

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В статье представлены результаты исследования экологогеохимического состояния снежного покрова как индикатора качества атмосферного воздуха г. Биробиджана. Выявлены основные природные и антропогенные факторы, предопределяющие экологическое состояние городской территории в зимний период (климатические, планировочная структура, стационарные и мобильные источники загрязнения). Определено, что выбросы основных загрязнителей во время отопительного сезона превышает летний в 6,5 раз. Проведены геохимические исследования снежного покрова на 60 экспериментальных площадках, заложенных в различных функциональных зонах города. Выявлено значительное превышение тяжелых металлов над фоновым уровнем: железа до 60, марганца до 50, меди до 40, цинка до 20, никеля до 12, свинца до 10, кобальта до 6 раз. С 2003 по 2018 годы содержание химических элементов в снеге увеличилось в 2 раза за счет мобильных источников загрязнения, ТЭЦ, котельных. Проведена сравнительная характеристика накопления тяжелых металлов в снеге за 2003 и 2018 годы и установлен ранжированный ряд загрязняющих токсичных веществ. Разработана шкала оценки загрязнения депонирующих сред по суммарному показателю концентрации тяжелых металлов, согласно которой в Биробиджане выявлено 5 уровней загрязнения снежного покрова. В целом экологическое состояние урбанизированной территории признано неудовлетворительным (8 площади территории относится к очень высокому, 14 к высокому, 21 к выше среднему, 27 к среднему уровням загрязнения, 30 к относительно чистым районам города). По полученным результатам разработана карта в программе ArcView GIS Экологогеохимическое районирование территории г. Биробиджана по уровню загрязнения снежного покрова с выделением наиболее загрязненных участков (70 от общей площади города является загрязненной). По результатам проведенных исследований предложены конструктивные методы планирования урбанизированной территории с целью улучшения ее экологического состояния: проведение геомониторинга (контроль загрязнения снежного покрова и своевременный его вывоз на специально оборудованные полигоны). Snow cover is taken as an indicator of air quality using Birobidzhan, a middlesize city in the Russian Far East, as a case study. The main natural and manmade determinants influencing the ecological state of the urban area in winter are identified: climate, a planning structure, and the stationary and mobile sources of pollution. During the heating season the emission of major pollutants exceeds the summer level by 6.5 times. The geochemical study of snow cover was performed at 60 experimental sites in different functional urban areas. A significant excess of heavy metals over the regional background level was revealed: iron up to 60 times, manganese up to 50, copper up to 40, zinc up to 20 , nickel up to 12, lead up to 10, cobalt up to 6 times. From 2003 to 2018 the content of chemical elements in snow increased in 2 times due to the mobile sources of pollution, thermal power plants, and boilers. The comparative characteristic of accumulation of heavy metals in snow for 2003 and 2018 is carried out, and the ranked number of polluting toxic substances is established. The scale of pollution assessment in depositing environments was developed using the cumulative indicator of heavy metal concentration. Five levels of snow cover pollution are found in Birobidzhan: low, moderate, above moderate, high and very high. As a whole, the ecological state of the urban area is considered as unsatisfactory (8 of the area with a very high level of pollution, 14 with high, 21 above moderate, 27 a moderate level of pollution, 30 a relatively clean area). According to the results, a map was developed in the ArcView GIS program Ecological and geochemical zoning of Birobidzhan, using the level of the snow cover pollution with the allocation of the most polluted areas (70 of the total area of the city is polluted). According to the results, a constructive method of planning in an urban area is proposed in order to improve its environmental condition: geomonitoring as a control of pollution in snow cover and its prompt removal to specially equipped landfills.

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